Pressure handle for pneumatic and electric portable drills



Nv. 14, 1944-- J. T. RICHARDS 'PRESSURE HANDLE FOR PNEUMATIC AND ELECTRIC PORTABLE DILLS Filed Dec. 19, 1941 2 Sheets-Sheet l l I l l l l I l I I |`I I PRESSURE` HANDLE FOR lPNEUMATIC AND ELECTRIC PORTABLE DRILLS Filed Dec:7 19, 1941 2 Sheets-Sheet 2l penetration by bit-can A Patented Nov. 14, 1944 SURE HANDLE FORPEUMAHCVAND i 4smoren/1 0L- rolr'mmgninmate i c 'rims J. rraiiesin'nihar'as, Wilkes-Berre, fm. Application December 19, 1941, Seal No; 423,675

' (C1. 'e7- iii 'l Briefly, theinventionfisnas `beforestated,in the f :3 This .invention relates to anew type handle hc'h `.is applicable to various types of portable `pneumatic and electric drills, rthe `-samje"be-ing tadapted 'to replaceor take thelplace of the `ordi- 'nary lor ,so-call vd .pipe handle which ,is o generally iisedgandembodyi'ng self-containedchain wind- ,vng means", whereby through Lthe .medium ,of said ,'.means and vthe work-.embracing chain, .constant pressure of the drill AisA maintained -,against ythe 'work .to Vaccomplish .the .drilling ,operation with ,expediency ,and reliability. I 11n. carrying out theprincip'les. .of the .inven- .tion,..I have .evolved .and produced .a 'simple .and vexpedient so-called...pressur,e .applying .handle which is A'such in construction .that-one man can, through the use thereof, drill .any size holewith ease .and .in less tirneqthantwo Lor .threemen Q-pushing Aor .pullingnandcam .atthe same time,

.10 .displacement from fsteady `the' drill VWhileidrilling .holes .head-high,

Vj sure handle in which the-pperator has .complete y-control-of pressure .-at all .times .and .on nearing control the vpressure. so thatlit .will :cnt through without any kick-back.

zThisfimprovedfdrill handle will-enablethe user 2te "drill for/long ,fp eriods of time without ffatigue,

rinsures constant `follow-up 'pressure of .the drill :against the work, savesjtime Aandmoney; fandsis .otherwise .aptly fitted for: :thefpurpos'es intended. -1Qtherrfeaturesand.advantages of ltheeinventipn :will :become morey .readily f apparentifromfthe .f ollowing deScIiption-and :the accompanying villustrative drawings.

vv.In the drawings rwhereinlike numerals are employed to designate like parts throughout the same: Y

Figure 1 isa View showing, in dotted lines, a conventional electric drill with the improved pressure applying manually twistable attachment handle attached to the body of the drill, and showing, further, how the work-embracing chain coacts with the work as well as the slack takeup means embodied in said pressure handle.

Figure 2 is an enlarged View, partly in section and partly in elevation, of the .pressure handle as constructed explicitly in accordance with the lprinciples ofthe instant invention. y

Figure 3 is a cross-sectional view taken on the irregular line 3--3 ofvFigure2.

.ouerhead, vunderneath or on aladder `incompara.. 20

formeffa 'handle attachment yand comprises a longitudinally elongated sleeve provided Awitlran .internal rbushing and y .ata .predetermined point. a turnable hand-grip provided with a fitting ltelescopical'ly and 'rotat- .ably j'itted in lone end portion of said sleeve, a worm vhavingShaft-etuis located in said sleeve, 0116"'Shat-end 'being iournaled in ,s'aidfttina `mean;.to,,n :raiinainthe nttingagainstiongitudmai .the sleeve, a. casing includ- ,ing .fa tubular'mem'her vsurrounding said sleeve, .said casing' also .including va gear housing profyided'lwithbearings, a .worm gear mounted in said h''usrig and rprovided with stub axles 'j Ourhousing., .said worm gear baiting .a peripheral portion ,thereof ,projecting through .the .slot in said sleeve, said worm being k:in meshthe teeth `on said.gear,.a cog-wheel ,flxedly `rnnunted.on v.one oi .the vstubaiiles `of said .worm..gear, A.and v.a Kchain .cooperable with .the :teeth .of .said me wheel.

rThe .sleeveis `cierran-.ged .by the 4numeral 3 and being 4a lock nut .B .to

opposite end of the sleeve is a suitably designed turnable hand-grip hiving a reduced.A extension .which projects ftelescopically and rotatably into the adjacent right-.hand end portion of .isaid fs1eeve.3. 4.l10n l.the.interior of :ine- -.5. -therezfbeing a .shaft v8 and the 'handle gextensionfone .end

.the ysleeve is a bush.- ybetween the :bushing `oi theshaft :being threaded Tinto; said l.e xtemSior/i .andv the op- -posite end :mounted-for @rotation .in 4the Abushing 5. The shaft is provided with an integral worm operable through a longitudinal slot in the mef dian iportion of the sleeve.

Figure 4 is a fragmentary detail sectional and elevational view showing a modification; namely, an adapter which is sometimes used for attaching the pressure handle to the drill.

The sleeve 3 is embraced in the horizontal tubular portion of a casing structure 2. The casing structure has companion half-sections bolted or otherwise secured together at 4. The lower portion of the casing embodies an integral substantially circular gear housing, that is, a housing for a worm gear Il. This gear H isprovided with central outstanding stub-axles journaled for rotation in opposed bearings formed in the side walls of said gear housing. One stub-axle extends out suiciently far beyond the gear housing as shown in Figure 3 to accommodate a cog wheel I3 which is flxedly mounted thereon for rotation therewith. The cog wheel obviously serves to accommodate the work-embracing and pressure-maintaining chain I4; The slot in the having aiengitudinai slot aforementioned sleeve 3 admits the toothed edge of the worm gear into said sleeve whereby to permit the worm 1 on the shaft 8 to mesh with said teeth.

For stability .an embracing or collar 9 surrounds the inner end portions of the casing section 2, this being adjacent the hand-grip IU. .Also a set-screw I is mounted in the casing and also in the sleeve 3, the inner end'thereof projecting into a groove formed in the handle extension, that is, the part which projects into the sleeve 3 as shown in Figure 2. The set-screw permits free rotation of the rotatable part Within the l sleeve but prevents endwise displacement thereof.

In practice the hooked end of the chain is wrapped around the work I6 (in this instance the I-beam), the opposite slack takeeupend yof the chain being connected With the cog-wheel I3 as shown in Figures 2 and 3. Thus, Iby .twistinglthe drill handle or grip IU as the drilling operation is carried on, the chain is maintained taut and the drill is pressed tightly against the work with progressive constancy. v

As brought out in Figure '1, the attachment or connection between the'pressure handle and drill is secured by the threaded extension on the sleeve end 3 and the lock nut `6.I In other instances it is desirable, perhaps, to also provide an alternative coupling connection. This is shown in Figure 4 which it will be seen that the adapter embodies a socketed plug which ts telescopically into the end of the sleeve 3, this serving, underl the circumstances, as a bearing forthe adjacent end of the shaft 8. The plug includes ay solid threaded extension Il to accommodate the aforementioned lock nut 6. Different sizes of adapters can be used to accommodate drills having variously sized accommodation side sockets.

It is thought that persons skilled in the art to which the invention relates will be able to obtain a clear understandingof the invention after' considering the description in connection` with the drawings. Therefore, a more lengthy description is regarded as unnecessary.

Minor changes in the shape, size and arrangement oi the details coming within thev field of invention claimed may `be Vresorted to in actual practice, if desired.

with the standard socket on one side of the portable drill, said tubular member being formed with a worm gear casing, said casing being provided with bearings, a worm gear mounted in said casing, said worin gear having stub axles journaled for rotation in the bearings in said casing, an anti-slipping chain winding drum xedly mounted on one end of the stub axles, a sleeve mounted in said tubular bearing, a hand grip including a worm, said worm being mounted for rotation in said sleeve and being in mesh with said Worm 2. A pressure handle attachment for portable "i, pneumatic and electric drills comprising a lonin the form of an attachment and comprising an elongated tubular mem-ber constitutingfa bearing, said bearing also forming an adapter and having at its inner end means for detachable connection gitudinally elongated sleeve provided with an internal bushing and having a longitudinal slot at a predetermined point, a turnable hand grip provided with a tting telescopically and rotatably tted in one end portion of said sleeve, a worm having shaft-ends located in said sleeve, one shaft-'end being journaled in said bushing, the `other shaft-end being connected with said hand grip tting, means to maintain the fitting against longitudinal displacement from the sleeve, a casing including a tubular member surrounding said sleeve, said casing also including a gear .housing provided with bearings, a worm gear mounted in said housing and provided with stub axles journaled in bearings in said housing, said worm gear having a peripheral portion thereof projecting through the slot in said sleeve,

.said worm being in mesh With the teeth on said gear, a cog Wheel ixedly mounted on one of the stub axles of said worm gear, and a chain cooperable with the teeth of said cog Wheel.

3. -As a new product of manufacture, a handle structure for portable drills ofthe class described, said handle structure being in the form of an attachment for said drill and comprising a casing embodying anelongated tubular member constituting an adapter and having at its inner attachable end means for detachable Econnection with the standard socket usually provided on one side of the drill, said tubular member being formed with a gear casing, said casing being provided with bearings, a gear mounted in said casing, said gear having axles journaled for rotation in the bearings in said casing, a work embracing and holding chain, a chain winding drum flxedly mounted on one of said axles,bushing means mounted in said tubular member, and a handgrip having a gear equipped portion mounted for rotation in said bushing means, the gear thereon being in mesh with said first named gear,

J. TALIESIN RICHARDS. 

